A. x-3
B. 4x
C. 4x+3
D. 4x-3
已知 (cos x)=(sin )^2x, 则 f(x)= __
[针对练1] 已知 (cos x)=(sin )^2x, 则 f(x)=-|||-__
设 f(x)= 2x ln (1-x), g(x)= sin^2 x,则当 x to 0 时 f(x) 是 g(x) 的()。A. 等价无穷小.B. 同阶但非等
1.单选题(1)当x→0时,f(x)=sin ax^3与g(x)=x^2ln(1-x)是等价无穷小,则()A. a=1B. a=2C. a=-1D. a=-2
已知f(2x)=x2-2x,则f(x)=( )A. $\frac{1}{4}x^{2}+1$B. $\frac{1}{4}x^{2}-1$C. $\frac{1
1.求下列极限:(2)lim _(xarrow dfrac {pi )(2)}dfrac (ln sin x)({(pi -2x))^2}1.求下列极限:(2)
设f(x)=arctan x,g(x)=sin (2x+pi )/(3),则g[f(-1)]= .设$f\left(x\right)=arc\ta
[单选题]已知f’(x)=sec2x+sin2x,且f(0)=3/2,则f(x)等于().A . B . C . D .
[单选题]设f′(cos2x)=sin2x,则f(x)等于()A . cosx+1/2cos2x+cB . cos2x-1/2cos4x+cC . x+(1/2)x2+cD . x-(1/2)x2+c
单选题函数f(x)=5ln(2x+1),则f(4.5)=( )A. 1B. 2C. 5D. 10